Add customizable forwardfor option

Change-Id: I484abdd19eaa4b4530a9d937b8391713e828af39
diff --git a/tests/pillar/single_forwardfor.sls b/tests/pillar/single_forwardfor.sls
new file mode 100644
index 0000000..2c78c52
--- /dev/null
+++ b/tests/pillar/single_forwardfor.sls
@@ -0,0 +1,11 @@
+haproxy:
+  proxy:
+    enabled: true
+    forwardfor:
+      enabled: true
+      except: 127.0.0.1
+      header: X-Custom-Header
+      if-none: true
+    mode: tcp
+    logging: syslog
+    max_connections: 1024